Improve datastore about cached trip details

web/drafting-board.js

@@ -1,11 +1,20 @@
 import { EL } from "./dom.js";
 import { displayTripDetails } from "./trip-details.js";
+import { fetchTrip } from './api.js';
+import { DataStore } from './datastore.js';
 
 let element_board = document.querySelector("#drafting-board-content");
 
 export function addJourneyToDraftingBoard(journey) {
 	element_board.innerText = "";
 
+	for (let leg of journey.legs.filter(item => !("walking" in item))) {
+		DataStore.tracked_trips.remember(leg.tripId, leg.origin.id, leg.destination.id);
+		fetchTrip(leg.tripId).then(result => {
+			DataStore.trips.remember(result.trip);
+		});
+	}
+
 	let station_offset = 0;
 	let trip_offset = 1;